Demonstration of 64x0.5Gbaud Nonlinear Frequency Division Multiplexed Transmission with 32QAM

Polarization-division multiplexed (PDM) transmission based on the nonlinear Fourier transform (NFT) is proposed for optical fiber communication. The NFT algorithms are generalized from the scalar nonlinear Schrödinger equation for one polarization to the Manakov system for two polarizations. The transmission performance of the PDM nonlinear frequency-division multiplexing (NFDM) and PDM orthogonal frequency-division multiplexing (OFDM) are determined. It is shown that the transmission performance in terms of Q-factor is approximately the same in PDM-NFDM and single polarization NFDM at twice the data rate and that the polarization-mode dispersion does not seriously degrade system performance. Compared with PDM-OFDM, PDM-NFDM achieves a Q-factor gain of 6.4 dB. The theory can be generalized to multi-mode fibers in the strong coupling regime, paving the way for the application of the NFT to address the nonlinear effects in space-division multiplexing.

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“…First, we compute v[N, λ] from the continuous spectraq 1,2 (λ) and invert the forward iterations (13). Second, at each iteration, we compute…”

Section: Inverse Nft Algorithmmentioning

confidence: 99%

“…Prior work has mostly focused on either continuous spectrum modulation [6][7][8][9][10], or discrete spectrum modulation [6]. Transmission based on NFT has been experimentally demonstrated for the continuous spectrum [11][12][13], discrete spectrum [14], as well as the full spectrum [15].…”

Section: Introductionmentioning

confidence: 99%

Polarization-division multiplexing based on the nonlinear Fourier transform

Goossens¹,

Yousefi²,

Jaouën³

et al. 2017

Opt. Express

102

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“…Modulating these phases, therefore, leads to different transmit pulses that can have different pulse durations T and bandwidths B. Besides, the Q d (λ k ) are transformed during propagation according to (4). Since all eigenvalues are necessarily distinct, the spectral amplitudes Q d (λ k ), and thus, pulse shape, pulse duration and bandwidth vary along the fiber.…”

Section: A Motivation and Scenariomentioning

confidence: 99%

“…For simplification and to be independent of the phase modulation format, we thus consider the maximization of T and B over all existing combinations of ϕ k . The absolute value of the spectral phases |Q d (λ k )| is not modulated, however it may change as well during propagation according to (4). Note that |Q d (λ k )| remains fixed for purely imaginary eigenvalues.…”

Section: A Motivation and Scenariomentioning

confidence: 99%

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On time-bandwidth product of multi-soliton pulses

Span

Aref

Bülow

et al. 2017

2017 IEEE International Symposium on Information Theory (ISIT)

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Multi-soliton pulses are potential candidates for fiber optical transmission where the information is modulated and recovered in the so-called nonlinear Fourier domain. While this is an elegant technique to account for the channel nonlinearity, the obtained spectral efficiency, so far, is not competitive with classic Nyquist-based schemes. This is especially due to the observation that soliton pulses generally exhibit a large time-bandwidth product. We consider the phase modulation of spectral amplitudes of higher order solitons, taking into account their varying spectral and temporal behavior when propagating along the fiber. For second and third order solitons, we numerically optimize the pulse shapes to minimize the time-bandwidth product. We study the behavior of multi-soliton pulse duration and bandwidth and generally observe two corner cases where we approximate them analytically. We use these results to give an estimate on the minimal achievable time-bandwidth product per eigenvalue.

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